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The current DirectFunctionCall functions use NULL as the flinfo in initializing the FunctionCallInfoData for the call. That means the called function has no fn_mcxt or fn_extra to work with, and attempting to do so will result in an access violation. These functions instead use the provided flinfo, which will usually be the caller's own flinfo. The caller needs to ensure that it doesn't use the fn_extra in way that is incompatible with the way the called function will use it. The called function should not rely on anything else in the provided context, as it will be relevant to the caller, not the callee. Original code from Tom Lane. Discussion: https://postgr.es/m/db2b70a4-78d7-294a-a315-8e7f506c5978@2ndQuadrant.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.